Is Qt open source?

[Saman]

Thanks alot ,
@ wysota, I saw you have developed a Qt widget library and have share it with others. Is there an integrated website for Qt programmers to share their libraries or even present their libraries for peer review and even integration into Qt? In codeproject I have seen occasionally some articles have posted about Qt under C/C++ but this site is too microsoftie and Qties are few over there.

[Lykurg]

Is there an integrated website for Qt programmers to share their libraries or even present their libraries for peer review

you can announce your apps/libs e.g. at http://www.qt-apps.org.

and even integration into Qt?

Of course only if they are really needed in Qt and are of very high quality. Therefore see http://qt.gitorious.org.